Reviewed are experimental methods (diffraction, spectroscopic, and resonance methods) used to obtain the structural parameters of bond angles and bond lengths in molecules. The valence shell electron pair repulsion theory (VSEPR) is summarized and applied to several real molecules. (CS)

An annotated list (books, magazines, and media) of sources of free and inexpensive science materials is provided, including addresses and costs (if any). (SK)

Comments on the significance of a brief 1909 article on physics instruction written by John Dewey for the "Symposium on the Purpose and Organization of Physics Teaching in Secondary Schools." Includes the article itself. (SK)

Traces the development of a project in which students at Utah State University have designed 12 experiments which will be contained in a trashcan-sized canister and placed inside the space shuttle "Columbia" during its fourth test flight. Describes some experiments and how they will operate. (DC)

Discusses three topics which should be included in any "basic" course in geometrical optics: (1) reflection; (2) refraction; and (3) image formation. (SK)

Although a complete oxygen meter is an expensive piece of equipment, homemade circuitry can be a suitable substitute if science teachers are aware of the limitations of the apparatus as well as of certain techniques for effective use. (PB)

Reinterpreted are findings obtained from cognitive preference test (CPT) literature and the author's personal research, in which the author states that data lend themselves to alternative explanations, not necessarily connected with cognitive preferences, and perhaps related more to "familiarity with content." Several suggestions for…

Encourages science teachers to include career education in their science teaching for two reasons: (1) to prepare those students leaning toward science careers, and (2) to emphasize the importance of scientific literacy for all students. Discusses methods of career education, including experience, job simulation, and vicarious experience. (CS)

Describes how to use a readability graph to determine the reading level of Biology textbooks. (MA)

Discusses natural carcinogens found in the environment, including background radiation, the ultraviolet component of sunlight, plants, and microorganisms. (CS)

Describes an advanced high school physics experiment demonstrating rotational kinematics and dynamics, using simple equipment such as empty coffee cans, inclined planes, meter sticks, and a large 10-second demonstration timer. (CS)

Discusses some of the problems associated with the organization of a British chemistry course. Results that can be achieved in this Mode 3 O-Level chemistry course are also discussed. (HM)

Presents the following three biology notes: (1) a low cost variable temperature incubator; (2) projects on the ecology of freshwater mussels (Unionidae); and (3) studies on urease. (HM)

Presents 12 chemistry notes for British secondary school teachers. Some of these notes are: (1) a simple device for testing pH-meters; (2) portable fume cupboard safety screen; and (3) Mass spectroscopy-analysis of a mass peak. (HM)

Presents six middle school science notes for British science teachers. Some of these notes are: (1) fingerprints; (2) the floating magnet; and (3) the production of electricity using a lemon. (HM)